This video shows you how to edit PDFs on any iPad, allowing you to write on it and then send the changes to anyone. It’s especially useful for school work these days! You can either screenshot the pages, or send the modified PDF.
Works well with learning platforms such as Oak Academy and ClassDojo.
You can write on it using your finger, use a really cheap stylus, pay a bit more for an electronic stylus (£25-£30) or go for the very decent (but pricey) Apple Pencil (£90-£120 depending on your iPad model). Just make 100% sure the make/model of stylus will work with your iPad before buying.